Ship-propulsion installation



D. 0. BLACK.

SHIP PROPULSION INSTALLATION.

APPHCATION mm JAN. 28, 1.918. RENEWED 050.31.1919.

1,336,020. Patented Apr. 6, 1920,.

DAVID CHRISTOPHER BLACK, OF ALLOA, SCOTLAND,

MARINE STEAM TURBINE COMPANY LIMITED, OF

LAND, ENGLAND.

ASSIGNOR TO THE PARSONS 'WALL END, NORTHUMBER- SHIP-PROPULSION INSTALLATION.

Application filed. January 28, 1918, Serial No. 214,166.

To all whom it may concern:

Be it known that I, DAVID CHRISTOPHER Billion, a subject of the King of Great Britain and Ireland, and residing at L Bank street, Alloa, in the county of Claokmannan, Scotland, have invented certain new and useful Improvements in and Relating to Ship-Propulsion Installations, of which the following is a. specification.

The present invention relates to ship propulsion installations of the type having one or more propellers driven by gearing.

In such installations, the large size of gear wheel required in the engine room necessitates a high center of shaft and consequently a high tunnel as compared with the usual reciprocating machine installation, and the object of the present invention is to minimize the loss of space involved where gearing is employed.

The invention consists in a marine propulsion installation including an engine and a propeller shaft, an intermediate shaft connected by gearing to the propeller shaft and to the engine shaft, and so disposed relatively to the propeller shaft that the displacement necessitated by the gearing is utilized to give a less obstructed or a greater hold space.

The invention further consists in an improved arrangement of the transmission gearing between an engine and a propeller comprislng an intermediate shaft connected by gearing to the propeller shaft and to the engine shaft and placed at a lower level than the propeller shaft, thus reducing the height of the tunnel in which it passes through the hold.

The invention further consists in the improved installation for ship propulsion hereinafter described.

Referring to the accompanying drawings:-

Figures 1 and 2 are respectively an elevation and plan showing one example of the invention.

In carrying the invention into effect according to the example illustrated, the

Specification of Letters Patent.

Patented Apr. 6, 1920.

Renewed December 31, 1919. Serial No. 348,545.

gearing is so arranged that the intermediate shafting 1s lower than the propeller shaft-111g and may be raked if necessary to suit the arrangement of the motors and gearin in the engine room. A single pro--- peller is employed, and the propeller shaft 1 is provided with a gear wheel 2, which gears by single or multiple gearing with the pinion 3 on an intermediate shaft 4:, this pinion and intermediate shaft being arranged at such lower level than the level of the propeller shaft- 1 as may be convenient.

The gearing between the intermediate shaft and the propeller shaft is placed as far aft in the ship as convenient. The intermediate shaft passes through the tunnel 6 to the engine room and is driven, as illustrated, through gearing 7.

I am aware that it has been proposed to drive a propeller through gearing, and in order to bring the weight of the motors as low as possible in the ship the motor shaft has been placed at a lower level than the propeller shaft. I do not, however, claim any such arrangement.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is In a marine propulsion installation, the combination of a. propeller with its shaft, an engine, a shaft intermediate the engine and the propeller shaft, axially displaced in relation to the propeller shaft, reduction gearing between the intermediate shaft and the engine, and gearing between the rear end of the intermediate shaft and the forward end of the propeller shaft and located as far aft as possible, whereby said intermediate shaft and gearing are located out of the way to save hold space, substantially as described.

In testimony whereof I have signed my name to this specification.

DAVID CHRISTOPHER BLACK.

Witnesses VVILLIAIWI DAGGETT, F. A. GrLBnsrY. 

